The lungs of course
The highest concentration of mitochondria in the human body is found in muscle cells, particularly in the muscles used for endurance activities like the heart and skeletal muscles.
The highest concentration of bicarbonate ions is found in the blood, where they help regulate the pH balance in the body. Bicarbonate is also present in smaller amounts in other bodily fluids, such as saliva and pancreatic secretions.
The smallest blood vessels are the capillaries.
calcium
Water
veins , capillaries, arteries
It strengthens blood capillaries.
hi raleigh
Capillaries
capillaries in the villi
capillaries
At the level of the capillaries, oxygen will diffuse out of the saturated red blood cells down their concentration gradient into the tissues where their concentration is lowest.